Configuring Encapsulation Options
Page 18-14
Configuring Encapsulation Options
You will configure frame encapsulation based on the destination MAC address or the destina-
tion switch port. Whether a frame is encapsulated based on the destination MAC or the port
depends whether the frame has a unicast, multicast, or broadcast destination.
Forwarding versus Flooding
Such frames will be handled in two ways:
•
Forwarded Frames. If the frame has a unicast destination address which has been learned
on a particular port, the encapsulation translation choices are driven by options associated
with the destination MAC address.
•
Flooded/Multicast Frames. If the frame has a unicast destination address which has not been
learned on a particular port, or if the destination address is a multicast address, then the
frame has to be transmitted on potentially many ports. In this case the encapsulation trans-
lation choices are driven by options associated with each destination port.
Port Based Translation Options
The translation options for ports allow configuration of IP and IPX protocols on a per encap-
sulation basis.
MAC Address Based Translation Options
The translation options for MACs arises from two possible sources.
• Inheritance from Port Options During Source Address Learning
• When a source MAC address is learned, the translation options of the port on which it is
learned are copied into the MAC-based database.
• Automatic Determination by AutoTracker
• When a frame is processed by AutoTracker as part of determining the VLAN to be associ-
ated with the MAC the frames protocol type and encapsulation are also determined. This
information is used to update/set the translation options in the MAC based database.
Which of these options is used is determined by setting the autoencaps option.
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